declare.def

android-w.song.android.widget

This file is declare.def, from which is created declare.c.
It implements the builtins "declare" and "local" in Bash.

Copyright (C) 1987-2010 Free Software Foundation, Inc.

This file is part of GNU Bash, the Bourne Again SHell.

Bash is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Bash is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Bash.  If not, see <http://www.gnu.org/licenses/>.

$PRODUCES declare.c

$BUILTIN declare
$FUNCTION declare_builtin
$SHORT_DOC declare [-aAfFgilrtux] [-p] [name[=value] ...]
Set variable values and attributes.

Declare variables and give them attributes.  If no NAMEs are given,
display the attributes and values of all variables.

Options:
  -f	restrict action or display to function names and definitions
  -F	restrict display to function names only (plus line number and
	source file when debugging)
  -g	create global variables when used in a shell function; otherwise
	ignored
  -p	display the attributes and value of each NAME

Options which set attributes:
  -a	to make NAMEs indexed arrays (if supported)
  -A	to make NAMEs associative arrays (if supported)
  -i	to make NAMEs have the `integer' attribute
  -l	to convert NAMEs to lower case on assignment
  -r	to make NAMEs readonly
  -t	to make NAMEs have the `trace' attribute
  -u	to convert NAMEs to upper case on assignment
  -x	to make NAMEs export

Using `+' instead of `-' turns off the given attribute.

Variables with the integer attribute have arithmetic evaluation (see
the `let' command) performed when the variable is assigned a value.

When used in a function, `declare' makes NAMEs local, as with the `local'
command.  The `-g' option suppresses this behavior.

Exit Status:
Returns success unless an invalid option is supplied or an error occurs.
$END

$BUILTIN typeset
$FUNCTION declare_builtin
$SHORT_DOC typeset [-aAfFgilrtux] [-p] name[=value] ...
Set variable values and attributes.

Obsolete.  See `help declare'.
$END

#include <config.h>

#if defined (HAVE_UNISTD_H)
#  ifdef _MINIX
#    include <sys/types.h>
#  endif
#  include <unistd.h>
#endif

#include <stdio.h>

#include "../bashansi.h"
#include "../bashintl.h"

#include "../shell.h"
#include "common.h"
#include "builtext.h"
#include "bashgetopt.h"

extern int array_needs_making;
extern int posixly_correct;

static int declare_internal __P((register WORD_LIST *, int));

/* Declare or change variable attributes. */
int
declare_builtin (list)
     register WORD_LIST *list;
{
  return (declare_internal (list, 0));
}

$BUILTIN local
$FUNCTION local_builtin
$SHORT_DOC local [option] name[=value] ...
Define local variables.

Create a local variable called NAME, and give it VALUE.  OPTION can
be any option accepted by `declare'.

Local variables can only be used within a function; they are visible
only to the function where they are defined and its children.

Exit Status:
Returns success unless an invalid option is supplied, an error occurs,
or the shell is not executing a function.
$END
int
local_builtin (list)
     register WORD_LIST *list;
{
  if (variable_context)
    return (declare_internal (list, 1));
  else
    {
      builtin_error (_("can only be used in a function"));
      return (EXECUTION_FAILURE);
    }
}

#if defined (ARRAY_VARS)
#  define DECLARE_OPTS	"+acfgilprtuxAF"
#else
#  define DECLARE_OPTS	"+cfgilprtuxF"
#endif

/* The workhorse function. */
static int
declare_internal (list, local_var)
     register WORD_LIST *list;
     int local_var;
{
  int flags_on, flags_off, *flags;
  int any_failed, assign_error, pflag, nodefs, opt, mkglobal;
  char *t, *subscript_start;
  SHELL_VAR *var;
  FUNCTION_DEF *shell_fn;

  flags_on = flags_off = any_failed = assign_error = pflag = nodefs = mkglobal = 0;
  reset_internal_getopt ();
  while ((opt = internal_getopt (list, DECLARE_OPTS)) != EOF)
    {
      flags = list_opttype == '+' ? &flags_off : &flags_on;

      switch (opt)
	{
	case 'a':
#if defined (ARRAY_VARS)
	  *flags |= att_array;
	  break;
#else
	  builtin_usage ();
	  return (EX_USAGE);
#endif
	case 'A':
#if defined (ARRAY_VARS)
	  *flags |= att_assoc;
	  break;
#else
	  builtin_usage ();
	  return (EX_USAGE);
#endif
	case 'p':
	  if (local_var == 0)
	    pflag++;
	  break;
        case 'F':
	  nodefs++;
	  *flags |= att_function;
	  break;
	case 'f':
	  *flags |= att_function;
	  break;
	case 'g':
	  if (flags == &flags_on)
	    mkglobal = 1;
	  break;
	case 'i':
	  *flags |= att_integer;
	  break;
	case 'r':
	  *flags |= att_readonly;
	  break;
	case 't':
	  *flags |= att_trace;
	  break;
	case 'x':
	  *flags |= att_exported;
	  array_needs_making = 1;
	  break;
#if defined (CASEMOD_ATTRS)
#  if defined (CASEMOD_CAPCASE)
	 case 'c':
	  *flags |= att_capcase;
	  if (flags == &flags_on)
	    flags_off |= att_uppercase|att_lowercase;
	  break;
#  endif
	case 'l':
	  *flags |= att_lowercase;
	  if (flags == &flags_on)
	    flags_off |= att_capcase|att_uppercase;
	  break;
	case 'u':
	  *flags |= att_uppercase;
	  if (flags == &flags_on)
	    flags_off |= att_capcase|att_lowercase;
	  break;
#endif /* CASEMOD_ATTRS */
	default:
	  builtin_usage ();
	  return (EX_USAGE);
	}
    }

  list = loptend;

  /* If there are no more arguments left, then we just want to show
     some variables. */
  if (list == 0)	/* declare -[aAfFirtx] */
    {
      /* Show local variables defined at this context level if this is
	 the `local' builtin. */
      if (local_var)
	{
	  register SHELL_VAR **vlist;
	  register int i;

	  vlist = all_local_variables ();

	  if (vlist)
	    {
	      for (i = 0; vlist[i]; i++)
		print_assignment (vlist[i]);

	      free (vlist);
	    }
	}
      else if (pflag && (flags_on == 0 || flags_on == att_function))
	show_all_var_attributes (flags_on == 0, nodefs);
      else if (flags_on == 0)
	return (set_builtin ((WORD_LIST *)NULL));
      else
	set_or_show_attributes ((WORD_LIST *)NULL, flags_on, nodefs);

      return (sh_chkwrite (EXECUTION_SUCCESS));
    }

  if (pflag)	/* declare -p [-aAfFirtx] name [name...] */
    {
      for (any_failed = 0; list; list = list->next)
	{
	  pflag = show_name_attributes (list->word->word, nodefs);
	  if (pflag)
	    {
	      sh_notfound (list->word->word);
	      any_failed++;
	    }
	}
      return (sh_chkwrite (any_failed ? EXECUTION_FAILURE : EXECUTION_SUCCESS));
    }

#define NEXT_VARIABLE() free (name); list = list->next; continue

  /* There are arguments left, so we are making variables. */
  while (list)		/* declare [-aAfFirx] name [name ...] */
    {
      char *value, *name;
      int offset, aflags;
#if defined (ARRAY_VARS)
      int making_array_special, compound_array_assign, simple_array_assign;
#endif

      name = savestring (list->word->word);
      offset = assignment (name, 0);
      aflags = 0;